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Old English sōþ (inherited)
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Old English synn (cognate)
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Middle English sooth (inherited)
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Proto-Germanic *sanþaz (inherited)
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Old High German sand (cognate)
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Proto-Indo-European *h₁es- (root)
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Proto-Indo-European *h₁sónts (inherited)
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Proto-Indo-European *h₁es- (derived)
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Old Norse sannr (cognate)
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Old Saxon sōþ (cognate)
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Ancient Greek ὤν (cognate)